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采用多种表征手段研究了一种降感奥克托今(D-HMX)的晶体特性、热性能及感度性能。采用折光匹配光学显微镜(OPM)、扫描电镜(SEM)、激光粒度仪、高效液相色谱、密度梯度法和X射线衍射(XRD)表征了D-HMX的颗粒形态、粒度、纯度、颗粒密度及晶型结构;采用差热扫描(DSC)、真空安定性实验(VST)研究了其热性能,通过机械撞击感度实验、摩擦感度实验和隔板实验研究其感度性能。结果表明,D-HMX是一类具有较高晶体品质的β-HMX单质炸药。与普通HMX(C-HMX)相比,D-HMX具有较好的颗粒形态和较少的晶体缺陷,热性能和感度性能明显改善。D-HMX的颗粒形状接近球形,为规则的几何多面体,无孪晶聚晶现象,晶面光洁,颗粒均匀,粒度分布窄,颗粒透明,内部无明显杂质和包藏物,纯度为(99.6±0.1)%,颗粒平均密度大于1.9016 g.cm-3,接近晶体最大理论密度1.903 g.cm-3且密度分散性小。DSC实验结果表明,D-HMX的β→δ晶相转变温度比C-HMX提高6℃,VST放气量明显小于C-HMX。隔板实验结果表明,基于D-HMX的浇铸和压装PBXs的铝隔板厚度比C-HMX降低10%~23%。另外,D-HMX的机械撞击感度也比C-HMX下降,特别是D-HMX细颗粒(FD-HMX),其特性落高为72.2 cm,爆炸概率24%,比C-HMX细颗粒(FC-HMX)的16.8 cm和88%表现出更强的抗撞击性。
A variety of characterization methods were used to study the crystal properties, thermal properties and sensitivity of a desensitized Aktokodzian (D-HMX). The morphology, particle size, purity and particle density of D-HMX were characterized by optical microscopy (OPM), scanning electron microscopy (SEM), laser particle sizer, high performance liquid chromatography, density gradient and X-ray diffraction Crystal structure. The thermal properties were studied by differential scanning calorimetry (DSC) and vacuum stability test (VST). The mechanical properties, mechanical susceptibility and friction sensitivity were studied. The results show that D-HMX is a class of β-HMX single crystal explosives with higher crystal quality. Compared with common HMX (C-HMX), D-HMX has better particle morphology and fewer crystal defects, and the thermal performance and sensitivity performance are obviously improved. The particle shape of D-HMX is nearly spherical. It is a regular geometric polyhedron with no twinned polycrystalline phenomenon, smooth crystal surface, uniform particle size, narrow particle size distribution and transparent particles with no internal impurities and inclusions. The purity of D-HMX is (99.6 ± 0.1) )%, The average density of the particles is more than 1.9016 g.cm-3, which is close to the maximum theoretical density of the crystal of 1.903 g.cm-3 and the density of the particles is small. DSC results showed that the β → δ phase transition temperature of D-HMX increased by 6 ℃ than that of C-HMX, and the VST deflation rate was significantly lower than that of C-HMX. Cladding The experimental results show that the thickness of the aluminum separator based on D-HMX casting and press-fitting PBXs is 10% ~ 23% lower than that of C-HMX. In addition, the mechanical impact sensitivity of D-HMX is lower than that of C-HMX, especially the D-HMX fine particles (FD-HMX), the characteristic drop height is 72.2 cm and the explosion probability is 24% -HMX) at 16.8 cm and 88% showed greater impact resistance.